Laboratory heater



FIG. 1 is a front elevational view of a laboratory heater showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof, a rectangular well being shown in the top wall to accommodate heater blocks;

FIG. 4 is a side elevational view of one side thereof, the other side being identical;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front elevational view of a laboratory heater showing a second embodiment of my new design;

FIG. 7 is a rear elevational view thereof;

FIG. 8 is a top plan view thereof, a rectangular well being shown in the top wall to accommodate heater blocks;

FIG. 9 is a side elevational view of one side thereof, the other side being identical;

FIG. 10 is a bottom plan view thereof;

FIG. 11 is a front elevational view of a laboratory heater showing a third embodiment of my new design;

FIG. 12 is a rear elevational view thereof;

FIG. 13 is a top plan view thereof, a rectangular well being shown in the top wall to accommodate heater blocks;

FIG. 14 is a side elevational view of one side thereof, the other side being identical;

FIG. 15 is a bottom plan view thereof;

FIG. 16 is a front elevational view of a laboratory heater showing a fourth embodiment of my new design;

FIG. 17 is a rear elevational view thereof;

FIG. 18 is a top plan view thereof, a rectangular well being shown in the top wall to accommodate heater blocks;

FIG. 19 is a side elevational view of one side thereof, the other side being identical;

FIG. 20 is a bottom plan view thereof;

FIG. 21 is a front elevational view of a laboratory heater showing a fifth embodiment of my new design;

FIG. 22 is a rear elevational view thereof;

FIG. 23 is a top plan view thereof, a rectangular well being shown in the top wall to accommodate heater blocks;

FIG. 24 is a side elevational view of one side thereof, the other side being identical; and

FIG. 25 is a bottom plan view thereof.

The electrical cord has been broken away in the middle in the drawing to indicate indeterminate length. 

The ornamental design for a laboratory heater, as shown and described. 